Mcolure



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Patented Deo. 29, 1896.

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(No Model.)

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HOT BLAST STCWE.

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PatentedDec. 29,1896.

G. W. 4MGQLURE. HOT BLASTSTOVE.

(No M odel.)

UNITED l STATES PATENT OFFICE GEORGE IVASI-IINGTON MCOLIIRE, OF PITTSBURG, PENNSYLVANIA.

HOT-BLAST STOVE.

SPECIFICATION formingl part of Letters Patent No. 574,041, dated December 29, 1896. Application filed October 17, 1895. Serial No. 565,933. (No model.)

To @ZZ whom t may concern.-

Be it known that I, GEORGE WASHINGTON MCOLURE, a citizen of the United States, re`

siding at Pittsburg, in the county of Alleglieny and State of Pennsylvania, have invented or discovered new and useful Improvements in Hot-Blast Stoves, of which the following is a specification.

In the accompanying drawings, which make part of this specification, Figure l is a verti-` cal central section on line I I of Fig. 5. Fig. 2 is a section on line II II of Fig. l. Fig. 3 is a central vertical section of the top of a modiiied form of stove. Fig. 4 is a section on line IV IV of Fig. 3. Fig. 5 is a section on line A B of Fig. 1. Fig. 6 is a section on line CD of Fig. 1. Fig. 7 is a section on line E F of Fig. 11. Fig. S is a section on line G H of Fig. 11. Fig. 9 is a section on line V V of Fig. 7. Fig. 10 is a section on line II II of Fig. 7. Fig. 11 is a central vertical section of top of stove, showing inner dome omitted.`

Fig. l2 is a section on line III III of Fig. 7.

Fig. 13 is a central vertical section of the top of a modified stove, showing middle Wall omitiiues.

My invention, generally stated, relates to improvements in the construction of two-pass fire-brick hot-blast stoves; and it consists in certain novel features more specifically described hereinafter and particularized in the claims.

In the accompanying dra\vings,which make part of this specification, 2 indicates the usual metal jacket of the stove. 3 is the shell of the stove, and 4 the lining of the same.

a b c CZ are four annular walls extending from near the top of the stove tonear the bottom of the same, and 5, 6, 7, and 8 the four annular iiues cut in two by a central wall. As seen in Figs. 5 and G, these iiues are not bonded into the lining of the stove, and iiues 5 and 6 are built also independently of'7 and 8.

The annular Wall d, extending from the top level of the flues to the top of the stack-Hue, forms the outer wall for combustion-chambers 9 9 and alsois notbonded into the lues. Springing from the inside of said wall d are the arc-shaped walls 10 10', which form inner walls for combustion-chambers which have usual reinforcing-walls ll 11.

12 is a central dividing-wall which extends from the inner dome 13 to the top of chimneyiiue. It is expanded into Wedge-shaped walls 14 14', where it meets the arc-Walls l0 l0', and

its central portion from the stack-flue to top of combustion chambers is formed by the abutting of the` two arc-shaped walls l0 10' against each other, but above the combustionchambers it extends across the stove independently of said arc-shaped walls. Space is here left for four additional fines 15 15.

The dome 13 is not bonded into the Walls of the shell and is capable of a vertical Inovenient in expanding and contracting.

13 is the keystone of the arch oi' the dome 13.

Girders are set on edge and support the flue structure and run around the stove, changing their levels,.ho\vever, to pass above the hot-blast inlet-flue and constituting a horizontal annular iiue 16, with which the vertical flues', 6, 7, S, and 15 communicate.

From` iiue 16 drop the two vertical annular iiues 17 18, the inner extending to the level of the top of the stack-flue and the outer to the base of the stove. Communication is made between 17 and 1S by openings 19 19 through the Wall-dividing iiues 17 and 1S, and

Vflue 18 communicates with the stack-tine 21 through radial flues 2O 20. (Seen in Fig. 8.) Opposite said radial iiues are cleaning-'doors 22 22, and opposite the openings 19 19 are cleaning-doors 23 23.

24 is the stack, having cold-blast inlet 25, said stack-outlet being controlled by valve 26, access to which is obtained by door 27.

28 is the hot-blast inlet, controlled by valve 28', and 29 the gas-inlet, controlled by valve 29'.

36 36 are air-inlets controlled by valves 36.

30 30 are cleaning-doors at the top of the stove.

31 is the roof of the stove, leaving space 32 between inner dome 13 and itself. In said crown or roof is seated outwardly-closing valve 33, the weight of which is not quite balanced by counterweight 34:.

In Fig. 13 is shown a modication where IOO the middle dividing-wall is omitted above the top level of the vertical flues, converting the double stove into a single stove.

In Figs. 3 and 4 another modiiication is shown, where an air-inlet 35 is provided in the top of the stove, having openings g g into space 82.

In operation when the first-described construction is on gas the hot-blast valve 2S' and the cold-blast valve are closed and the gasvalve 29 and air-valves 3G opened. Gas is supplied to both combustion-chambers by the common gas-inlet 29 and air by the two airinlets 3G 3G. The gas and air burn in the combustion-chambers 9 and 9', ascending said chambers separately and then being evenly and uniformly distributed in each half and drawn down ilues 5, 6, 7, and 8 and iiues 15 15 to the halves of horizontal annular flue 1G, then to vertical fines 17 and 1S, thence by flue 1S to radial flues 2O 20, which lead to stack-fine 2l and to stack 2li. By this arrangement two independent stoves are secured and irregularity of draft is practically impossible. lVhen the stove is sufliciently heated, the stack, gas, and air inlets are cut off and thc cold blast turned on and the hotblast valve opened, the cold blast making a retraverse directly opposite to the path just described. Meantime valve 33 has been dropped, permitting cool air to enter and circulate beneath the roof 31, thus avoiding overheating thereof. Should the blast leak through the dome 13 to any great extent, the pressure will seat valve 33 and prevent loss of heat. In the construction, however, shown in Figs. 3 and -ladditional air is supplied to that portion of the stove immediately below the inner dome and combustion thereby quickened there by the introduction of air through valve and air-passage 35. Vliile this air is thus being sucked into the stove proper by the chimney draft at the same time the heated air accumulated between the roof and the false roof of the stove is sucked out of the intermediate space between said two roofs through the openings g g, which openings are most clearly seen in Fig. a. The air thus'withdrawn from said roof-space passes down into the body of the stove. W'hen the blast is on, valve will be seated automatically.

A very eiiicient form of stove, although not equal to the one iirst described, is illustrated in Fig. 13, where by omitting the upper part of the middle separating-wall the combined burning gases from both combustion-chambers en ter a common space beneath the dome and are distributed indilferently right and left to the vertical iiues, while the independency of the two combustion-chambers proper and of the two halves of the vertical lines is still maintained.

The combustion-chambers need not be necessarily segmental in cross-section, but may be circular.

In Fig. 11 I show how air may be supplied through the top of the stove to reinforce the bottom air-inlets and where the inner dome of the stove is omitted but the dividing central wall retained.

The great freedom of movement of the parts of the stove among themselves and the facility for repairs, itc., resulting from my style of construction will be apparent to those skilled in the art.

Having described my invention, I claiml. In hot-blast stoves, the combination of a shell inclosin g the combustion-chamber, fines, (be. a vertical cross-wall dividing said shell into substantially two equal parts and eX- tending down to the stack-liuc; an independent combustion-chamber and semicircular vertical fines on each side of the wall; a stack- 'iiue in the base of the stove and connections between the combustion-chambers and their respective vertical iiues and between the said vertical iiues and the smoke-stack.

2. In hot-blast stoves, the combination of a shell; a false roof or dome leaving an airspace between itself and the roof proper and permanent opening through the false roof into the stove whereby additional air may be supplied to the upper portion of the stove to quicken the combustion there.

3. In hot-blast stoves the combination of a shell, a lining for said shell; two sets of semicircular vertical iiues built within but independent of said lining; two sets of inner semicircular flues built within the first sets but independent thereof and an annular wall inclosing the combustion chambers built within but independent of said inner sets of vertical fines.

4. In hot-blast stoves the combination of a shell inclosing the combustionchambers, iiues, &c., a vertical cross-wall dividing said shell into substantially two equal parts and extending down to the stack-fine; an independent combustion-chamber and semicircular vertical lines on each side of the said wall; a stack-line in the base of the stove; a common gas-inlet to said two combustionchambers and an air-inlet to cach of said chambers and connections between the combustion-chambers and their respective vertical iiues and between said vertical iiues and the smoke-stack.

5. In hot-blast stoves, the combination of a shell; a central vertical dividing-wall; an annular wall in the center of said shell forming the outer wall of two combustion-chambers and a pair of arc-shaped walls sprung from the interior of said annular wall and constituting the inner walls for said two combustion-chambers.

6. In hot-blast stoves, the combination of a shell; a central dividing vertical wall and a series of semicircular vertical flue -walls wedged between the two ends and on each side of said central dividing vertical wall.

7. In hot-blast stoves, the combination of a IOO IOS

IIO

extending` from the level of the top of the semieircnlar vertical flues down to the stackilue; en independent combustion-chamber and selnicirenlztr vertical lues on each side of said Weill; a stack-flue in the base of said stove and connections between the con1bustion-clia1nbers sind their respective vertical lines and between said vertical ilues and the smoke-stack. v

In testimony whereof I have hereunto set my hand this 15th day of October, A. D. 1805.

, GEORGE WASHlNGTON MCCLURE.

Witnesses:

WM. L. PIERCE, LUCY DoRsEY IAMS. 

